09-27-2011 04:02 PM
I'm using a ratiometric sensor with an NI WSN-3202 node, and I'd like to be able to know exactly what voltage the node is providing as excitation so that I can properly determine the sensor reading. Is there any way to read out this value? I know it's supposed to be 11.5-12.5 volts, but that's an awfully big range and I'd like to know what it actually is.
03-28-2012 12:14 PM
Are you using all of your analog channels?
Why not use one of them to measure the excitation voltage?
03-28-2012 03:16 PM
If you measure the voltage once, it should remain pretty steady. However, it can drift with operating temperature and the like. I believe the wide spec is due to the tolerance of the hardware and you won't really see that full range with your specific node.